The ornamental design for a batterycharger, as shown and described.
FIG. 1 is a left side, front, top perspective view of a battery charger according to the present invention;
FIG. 2 is a top view of the battery charger of FIG. 1 according to the present invention;
FIG. 3 is a bottom view of the battery charger of FIG. 1 according to the present invention;
FIG. 4 is a right side view of the battery charger of FIG. 1 according to the present invention;
FIG. 5 is a left side view of the battery charger of FIG. 1 according to the present invention;
FIG. 6 is a rear view of the battery charger of FIG. 1 according to the present invention; and,
FIG. 7 is a front view of a battery charger according to the present invention.
The broken line showing of battery charger is for the purpose of illustrating environmental structure and forms no part of the claimed design. The broken line(s) which define the bounds of the claimed design form no part thereof.